ppp's two subnets...

at first i thought i was losing my mind, that i had some type of misconfiguration with ppp...  but i didn't...  ppp will display 2 subnets for each directly connected route; one with the mask that was designed and also a slash 32... this is the behavior of ppp...


no routing protocols, no static or default routes, and with hdlc we have:

r2620_01#sh ip route
Codes:
Gateway of last resort is not set

     1.0.0.0/24 is subnetted, 1 subnets
C       1.1.1.0 is directly connected, Loopback0
     10.0.0.0/30 is subnetted, 2 subnets
C       10.0.30.0 is directly connected, Serial0/1
C       10.0.20.0 is directly connected, Serial0/0
C    192.168.1.0/24 is directly connected, FastEthernet0/0
r2620_01#

and likewise for the routers...

r2620_02#sh ip route
Codes:
Gateway of last resort is not set

     2.0.0.0/24 is subnetted, 1 subnets
C       2.2.2.0 is directly connected, Loopback0
     10.0.0.0/30 is subnetted, 1 subnets
C       10.0.20.0 is directly connected, Serial0/0
C    192.168.1.0/24 is directly connected, FastEthernet0/0

but when you flip to ppp...

r2620_01(config-if)#do sh ip route
Codes: Gateway of last resort is not set

     1.0.0.0/24 is subnetted, 1 subnets
C       1.1.1.0 is directly connected, Loopback0
     10.0.0.0/8 is variably subnetted, 4 subnets, 2 masks
C       10.0.30.0/30 is directly connected, Serial0/1
C       10.0.30.2/32 is directly connected, Serial0/1
C       10.0.20.2/32 is directly connected, Serial0/0
C       10.0.20.0/30 is directly connected, Serial0/0
C    192.168.1.0/24 is directly connected, FastEthernet0/0
r2620_01(config-if)#

r2620_03#sh ip route
Codes:
Gateway of last resort is not set

     3.0.0.0/24 is subnetted, 1 subnets
C       3.3.3.0 is directly connected, Loopback0
     172.16.0.0/30 is subnetted, 1 subnets
C       172.16.0.0 is directly connected, FastEthernet0/0
     10.0.0.0/8 is variably subnetted, 2 subnets, 2 masks
C       10.0.30.0/30 is directly connected, Serial0/0
C       10.0.30.1/32 is directly connected, Serial0/0
r2620_03#

ppp is the gift that keeps on giving...